<!--
 * @Author: shuai
 * @Date: 2021-03-31 13:46:52
 * @LastEditors: shuai
 * @LastEditTime: 2021-04-04 09:50:41
 * @Description: file content
-->
<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script lang="ts">
import { defineComponent } from 'vue'
import { compile } from 'path-to-regexp'
import { RouteRecord, RouteLocationMatched } from 'vue-router'
export default defineComponent({
  data() {
    return {
      levelList: (null as unknown) as RouteLocationMatched[],
    }
  },
  watch: {
    $route() {
      this.getBreadcrumb()
    },
  },
  created() {
    this.getBreadcrumb()
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter((item) => item.meta && item.meta.title)
      const first = matched[0]

      if (!this.isDashboard(first)) {
        matched = [({ path: '/dashboard', meta: { title: 'Dashboard' } } as unknown) as RouteRecord].concat(matched)
      }

      this.levelList = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
    },
    isDashboard(route: RouteRecord) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.toString().trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
    },
    pathCompile(path: string) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route
      var toPath = compile(path)
      return toPath(params)
    },
    handleLink(item: RouteRecord) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect as string)
        return
      }
      this.$router.push(this.pathCompile(path))
    },
  },
})
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
